John Emerson (June 4, 1859[1] – July 25, 1932) was the 15th mayor of Calgary, Alberta. He was the mayor at the time that Alberta became a province of Canada, which was on September 1, 1905.

Born in England, Emerson emigrated to Calgary in 1885 and began farming on a homestead just outside the city limits. Soon he left farming and established a successful grocery business on Stephen Avenue.